const http=require('http');
http.createServer(function(request,response){
    //发送HTTP头部
    //HTTP状态值:200:OK
    //内容类型:text/plain
    response.writeHead(200,{'Content-Type':'text/plain'});
    //发送响应数据"Hello Server"
    response.end('Hello Server');
}).listen(8888);
//终端打印如下信息
console.log("Server running at http://127.0.0.1:8888/");